Automatic furnace-damper.



" A. w. ARNOLD.

AUTOMATIG FURNACE DAMPER.

APPLICATION FILED NOV. 14, 19 11. i

Patent'ed Nov. 25, 1913.

rnrnnr .onmon.

ARTHUR ARNOLD, 0F JN'EW'YQRK, N. Y.

Specification of Letters -Patent.

ia plieatipnfiled Novemher 4 1. .l-

'PatentedNoV. 25, 1913. elf el .Ne- 66 ,234-

To all wkomt may concern Be it .known that I, ARTH R AR oLn, a citizen .of the United ,States, residing .at New Yorlncounty of New Yorlgand State of New York, have rinventedanew and til-e ful Automatic Furnace-Damper, of which the following is a specification.

This invention relates to that W pe of dampers .or draft governors which are deigned to operat autemat ea ly under the influence of the draft itself :to maintain a substantially uniform combustion of fuel, ,in accordance with the conditions for which the devices may Joe adjusted.

Among bieet of this inv nti n a e to provide a devieeof-thecharacterset-forth possessing novel and flicient .oountenpoise mechanism, peculiarfmeans-to retard or control the speedlofthedainper wings, and ,a simple and convenient form of m ans {to temporarily lock the dam-per open.

The :foregoing and other olojects are ;attained in a Y satisfactory manner =th11ongh gthe means hereinbelow fully tdesqribed and claimed, and illustrated the accompanyng drawings, though kit is t he nnde iet edthat such illustrations are butsnggestive of i one of the many forms which .the ,invention may he made to assume Without departing from the spirit (of :the appended I In the drawings, Figure ;l is a perspective view ofa dampermade in aeeordanoe with this invention, the several parts being operative ,position, set for operation Joy {a light draft :Fig. 2 is a fragmentary perspective view indicating ithe application of the aforesaid locking :means, and Jlig. is detail described below.

Throughout the following desoriptiomand onthe several figures of ythetdrawings similar parts :are referred :to Joy like Reference characters.

n e e bodimen h th invention disclosed 10 indicates a ,sleeve :or collar which may comprise a plurality of sections 10 and 10 fastened together byscrews or loolts 11 passed through oppositel idi epesed :flanges 12. By means ofsaid fastening ,Inea-ns {the collarsections may be separatedrmoreior less in applying the collar [to the pipe or flue (not shown) in whichtthe :damper is being fixed and-thensnugly clampedin plaee, even though theremay-be a variationinrthe eli emeterszo fidifierent pipes supposedly of the ame size lllhe wings -13 .1 ar se ured to and tet with er ir e gp e ods 1 j e n led n hnpei-te .P-ert e the e lar and a e normally arehden said ,rods when th ampe i Q'P ni lheal uee .1 aresee re t e he reds .11 ieppe ite th Wings en t e t er th .eeun hel ee Jmeehanie eentrel the ipes ien t r piwetal meuem nt [e he wings :Said re imte ba en e omp ise meme -her 0 hi h Qllfi-m moreifiexible ei hts, su h a eheins 1. a e atta h d- Eaeh i hail i h wn latteehe 'eh eh to aid .crees e b aneehe P01351011 the eof ben u tab sa nented a a y c n en en P i-ht th whi h th ehei er eheins may heime iphla efl he ii,11 .1 str ie v sh ws for this perrese a 1 911 o si ppe t 119 for eeeh ehaih, hut i a enne eh zthet unde ie rta 'eenditions ,a single support otherwise -10.- cat d as-z ier-instaneeat uppe fioenmight he a li plqyed for-either er :both chains. Eeeh hain henes n :l ep, sha re at on -h e f Fleet-w en he ibettem .of the loan-and l e-i 10 :at eehm h en he wes er deterth r fi eti ve he 1 f ithe zhe n, a d Wh eh he t :ve ie le i v rsely in ee rdanee with 't eh ieht of djustm n f th he ke h euppe ted en o t e hain. As he dampe M n-g wine ewa d the l. e 1 110-- iti n th ewes he -des end eeus nev me of th ee hte h lene ll nk t h add su e .siveL-ysto thefi-xed supporting ,lzneans.v The efieet uethefst or finfl enee t erefore of t ilne halane gradu l y h eeme le e the damper wings approach the position whe the ma imum are [thereof is le gh int the pa i t d fi the h in senp r dse a tefer -eileep of m xil-11m sleheth th efieet re zllk fi thereof :i th greatest, wh e y he-dampe w operaated toward its closed portion under the infiuenceiofthe lightest draft. The shorter the ,loop, (or cennection betweenthe cross-bar nd t support th he vier will the the .fire ha wil eauee r =te el seth damper- A p i f inks .0 han e 2 r .p v ta' y connected at :20 to the levers and are adjhs e -y 'ee-n te o g a s ies of ho e .7 t he-ewe her- Wh n ha ge are connected to the cross bar ;points 4 distant fremi ts .eenter t 7119 1 efthe coun erweight upon the levers is applied in a direction approximately tangential thereto, but when the hangers are set in holes 17 nearer the center of the bar the initial pull of the weight is applied in a direction approximating the radius, requiring a heavier fire to start the damper Wings toward the closed position, though after such start and the levers swing downward the pull becomes more eflective due to its application in a direction approaching the tangential or at right angles to the levers.

The upward swing of the damper wings and hence the proportion of the flue area that will be closed thereby may be determined by a bumper plate 21 against which the levers will impinge. The ends of the bumper plate may be bent upward more or less so as to determine once for all the necessary downward swing of the levers in ac cordance with the draft conditions or other requirements of each damper being installed. The bumper plate is shown as 7 being rigidly secured upon an angle bracket 22'by means of a lug 23, the bracket being connected permanently to the collar 10. As shown in Fig. 3 the lug has an oblong shank 23 which is passed through the bracket and plate and then upset, the form of the shank preventing the plate from swinging about in a horizontal plane.

Studs 24: secured to the collar and projecting inwardly therefrom above and below the pivot rods prevent any possibility of the flue sections engaging said rods and interfering with free action of the wings.

Should it be desirable. to temporarily I i positively lock the wings open, as for. in-

stance in starting a fire, this may be accomplished in a simple and effective manner by means of the key 25 which may be introduced between the levers transversely of the parallel planes in which they move, as shown in Fig. 2, the notches 25 of the key interlocking with the opposed inner edges of the levers. The form of the key is such that it will stay in the place illustrated, but

may readily be thrust in or pulled-out with the fingers for the purpose stated. The key may conveniently be connected to one of the chains to prevent its loss when not in use.

The retarding means alluded to above comprises a sinuous or corrugated rod 26 detachably suspended from a fixed point, as

for instance the lug 23 at 26 and extending loosely downward through a vertical hole or eye 17 in the cross bar. While the rod offers no obstruction to the cross bar in its ordinary movements, it is impossible for said bar to pass along the bends in the rod 26 sufficiently rapidly to permit the wings to thump or pound in either direction of their movement. Any means, such as a I weight 27, carried by the lower end of the rod 26 which will resist its vibration due to the movement of the cross bar along the sinuations, will serve to still further reduce the speed of the wings.

I claim:

1. In an automatic damper, the combination of a pair of normally pendent pivoted wings, oppositely arranged levers connected to sa1d wings, a cross bar connected to said levers, and flexible Weight means of variable effective heft connected to and suspended from both ends o f said cross bar.

2. In an automatic damper, the combination of a normally pendent wing and counterweight mechanism therefor comprising a flexible weight whose one end is connected to the wing and a support for the other end thereof whereby the intermediate portion of the weight is formed into a depending loop of variable length and effective heft, substantially as set forth.

3. In an automatic damper, the combination of a pair of wings adapted to be moved by the force of the draft and means to control the speed of such movement, said controlling means including a member connected to said wings and having a vertical eye, and a sinuous rod extendin through said eye, substantially as set fort i.

4. The combination with the movable portion of an automatic damper, of retarding means therefor comprising a vertically movable member connected to said portion and having an eye, and a sinuous rod fixed from vertical movement and extending through said member eye, substantially as set forth.

5. The combination with the movable ortion of an automatic damper, of retar ing means therefor comprising a vertically movable member connected to said portion and having an eye, a sinuous rod extending through said eye and vibratable laterally, and means to resist such vibration, substantially as set forth.

6. In an automatic damper, the combination of a pair of movable wings, a cross bar connected to said wings and movable simultaneously therewith, counterweight means connected to said cross bar, and retarding means for the wings and cross bar comprising a bent rod extending through the cross bar.

7. In an automatic damper, the combination of a collar, a pair of wings pivoted in the collar, a pair of levers connected to said wings, and bumper means to limit the movement of said levers, said bumper means comprising a plate, a bracket connected to the collar, and a lug having an oblong shank securing the plate to the bracket, substantially as shown and described.

8. In an automatic damper, the combination of a pair of pendent pivoted wings, a pair of levers secured to said wings and movable in parallel planes, and means to temporarily positively lock said levers and wings from movement, said locking means comprising a key introduced between the levers transversely of said planes, substantially as set forth.

9. In a draft operated damper, the combination of a damper member mounted to swing, a flexible counterbalance therefor and a support adapted to receive portions of the counterbalance successively as the damper swings from open to closed positions, Whereby the effective influence of the counterbalance upon the damper member is varied inversely to the effective force of the draft upon said member throughout the swing thereof.

In Witness whereof I have hereunto aflixed my signature in the presence of two witnesses.

ARTHUR W. ARNOLD. Witnesses G. L. BEELER, F. E. ARNOLD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

